Mudit Mathur1, J A Sykes, V R Saxena, S P Rao, G M Goldman. 1. Division of Pediatric Critical Care, Department of Pediatrics, SUNY Downstate College of Medicine, The Children's Hospital at Downstate, Brooklyn, NY, USA.
Abstract
OBJECTIVE: To describe extreme hypercalcemia as the presenting feature of acute lymphoblastic leukemia in an 8-yr-old girl and the combined use of pamidronate and calcitonin for its treatment. DESIGN: Case report. SETTING: Pediatric intensive care unit. PATIENT: An 8-yr-old girl with 20.0 mg/dL serum calcium (reference range, 8.8-10.4 mg/dL) and 2.66 mmol/L ionized calcium (reference range, 1.13-1.32 mmol/L). INTERVENTION: Intravenous pamidronate and subcutaneous calcitonin. MEASUREMENTS AND MAIN RESULTS: Our patient presented with nausea, vomiting, lethargy, weight loss, fatigue, and weakness but, remarkably, did not exhibit electrocardiographic changes. Initial treatment with hydration at 8 mL x kg(-1) x hr(-1) and furosemide was ineffective. A single dose of 1 mg/kg intravenous pamidronate given over 24 hrs complemented by three doses of 5 units/kg subcutaneous calcitonin over 36 hrs lowered serum calcium to a normal range within 3 days. Side effects noted were hypocalcemia, hypomagnesemia, and hypophosphatemia. They were most pronounced 7-9 days after treatment, stabilized with supplementation, and returned to acceptable ranges by 1 month without need for ongoing electrolyte supplements. A renal computed tomographic scan did not show nephrocalcinosis. The patient remained free from recurrence of hypercalcemia 6 wks after initiating chemotherapy for acute lymphoblastic leukemia. CONCLUSIONS: Extreme hypercalcemia can be a presenting feature of acute lymphoblastic leukemia, but it may not result in life-threatening organ dysfunction. Combined treatment with pamidronate and calcitonin should be considered for treating hypercalcemia that does not respond to conventional therapy with hydration and furosemide.
OBJECTIVE: To describe extreme hypercalcemia as the presenting feature of acute lymphoblastic leukemia in an 8-yr-old girl and the combined use of pamidronate and calcitonin for its treatment. DESIGN: Case report. SETTING: Pediatric intensive care unit. PATIENT: An 8-yr-old girl with 20.0 mg/dL serum calcium (reference range, 8.8-10.4 mg/dL) and 2.66 mmol/L ionizedcalcium (reference range, 1.13-1.32 mmol/L). INTERVENTION: Intravenous pamidronate and subcutaneous calcitonin. MEASUREMENTS AND MAIN RESULTS: Our patient presented with nausea, vomiting, lethargy, weight loss, fatigue, and weakness but, remarkably, did not exhibit electrocardiographic changes. Initial treatment with hydration at 8 mL x kg(-1) x hr(-1) and furosemide was ineffective. A single dose of 1 mg/kg intravenous pamidronate given over 24 hrs complemented by three doses of 5 units/kg subcutaneous calcitonin over 36 hrs lowered serum calcium to a normal range within 3 days. Side effects noted were hypocalcemia, hypomagnesemia, and hypophosphatemia. They were most pronounced 7-9 days after treatment, stabilized with supplementation, and returned to acceptable ranges by 1 month without need for ongoing electrolyte supplements. A renal computed tomographic scan did not show nephrocalcinosis. The patient remained free from recurrence of hypercalcemia 6 wks after initiating chemotherapy for acute lymphoblastic leukemia. CONCLUSIONS:Extreme hypercalcemia can be a presenting feature of acute lymphoblastic leukemia, but it may not result in life-threatening organ dysfunction. Combined treatment with pamidronate and calcitonin should be considered for treating hypercalcemia that does not respond to conventional therapy with hydration and furosemide.